When I mow the lawn, without exception, I use a line trimmer along the edges of the concrete walkways.

I line-trim first, and then I mow the rest of the grass.

Then I use a blower to clear the sidewalks of clippings.

Neat edges and tidy walkways make the whole lawn look its best.

It's similar with documents, drawings, haircuts, and serving dishes. Clean margins, edges, and borders give the viewer a signal. This was intentional. This was done with care. These details matter, and so do the other details that you can't see from where you're standing. But you trust that the rest is just as good.